Driving-belt.



H. HESS.

DRIVING BELT APPLICATION FILED 00T.22, 1909.

' Fig 3. 31. g u Patented Oct. 13, 1914.

To 'a'll 'uikom it concern;

' H a c t env of the United States, residin at Wawa,,= in.

i tate of Penn-- PATENT O F C QB; "jitknown the? I, Henri tiie couiityofDelaware and sylvania,have invented certaininew and useful which thefolliiwirig is sa specification, refer; ence being had therein to theaccompanying drawing.

transmitting power, the object being to providea belt which will combinea POSltlVB driving actionand a frictional driving actron, therebysecuring the maximum power 16 transmission with silent operation.

With this object in view, my invention consists primarily in forming thebelt of a.

plurality of layers of flexible material provided at intervals withtooth engaging holes to receive the teeth on the driving and drivenpulleys or wheels, whereby by the codperation of the teeth in the holesa positive driving action is secured, and iwhereby. by the coiiperationof the surface of the belt with 2,9 the surface of the pulley africtional drivmg action is secured.

The invention consists also in connecting the layers of the belttogether at intervals,

0-0. Fig. 3 is a similar view on the lineof the belt in modified orm.

bb. Fi 4 is a cross-section Referring to the drawings: Myimproved' beltconsists of superposed layers 1 and 2 of flexible materials, preferablydissimilar in character, such-as thin metal and a rela-' 46 tively thicksofter material, as leather, can- 1 vas, or" the like. In Fig. 1 I haveshown fivepf such layers, 1 representin the thin a metal layer, and2'the thick leat er'layer. These layersarwprovicled at intervals with Iforatlons 3 forming tooth engaging holes fii w'hieh the teeth of thedriving and driven {pulleys are adapted to extend and eflect a "positivedriving action between the parts.

he surface of the belt surrounding and be- It tween the holesis flat andadapted. to bear flatly against and embrace the rim of the! 11 p nIivING-B ELT.

attenuat on tmiersrtht." Application gust outset 22 con. serial no. sems.

This invention relates to driving belts fornot. according to harm? nasaorwawa iennnsnvsnis.

Patented-001x113, 1 914.

pulleyand-in this manner effect a frictional driving action between theparts In. ordervthat; the tooth pressure on the belt may'gibe the sameand not be confined to the points of immediate contact 'ofthe teeth inthe holes, I apply to the belt at intervalscorresponding to the holestherein, transverse devices 4 in the form of metal plates or strapsformed with openings corresponding to those in the belt, the walls ofwhich openings constitute tooth engaging surfaces. These plates arenarrow in proportion to their transverse extent and are firmly securedto thebelt'in any suitable manner. In the present instance, they areshown as being fastened by rivets w, w,'and as havin their ends bentaround the edges of the be t, as at.5, to tightly embrace the same. Theyare further shown as tending in the holes in the belt and servingtoprotect the edges of the layers by preventing the driving teeth fromdirect contact therewith. In this construction it will be seen that theressure of the teeth in the sockets or thim les will be transmitted tothe transverse plates and by'them transmitted throughout the Width ofthe belt. By reason 0 the fact that the plates are narrow in lproportionto their transverse extent, they wi I not interfere with the flexibilityof the belt, or prevent the same from closely huggingthe curved surfacesof the pulleys.

In Fig. 4 I have shown a modified form of the belt. In this case, thelayers 1, 1", etc., are all of thin metal, and between these layers areinterposed thin sheets 7 of paper cork or similar flexible material,whichmay be connected to one of the metal layers or thethickness of thesheet. This construction produces a belt substantially of metal, andbf aflexibility far in excess of a solid metal bodyof the same thickness.

The formation of the belt as described as ofothestrength and qualitiesdemanded by a positiveJooth-drive, while at .the same time it possessessuch flexibility that it will wheel, 'the action most favorable forfrictional drive. I

It .will be understood that the specific form of the beltms'tybevariously modified and fchanged irs i-egards thecharacter, thickness andnuzi ber'of the different layers and distributed over a wide area ofbeing provided with thimbles or eyes 6 ex-' closelyembrace and hug thesurfaceof thea composite structure gives to the same all claim.

the inannemof arranging them. It will be? further understood that thetransverse con-- necting plates may be entirely dispensed wit-h and thebelt'employed with the teeth' of the wheel engaging directly in theholes therein, my invent on :nbtblhg to any specific form .or detail,expe t ingso far as such limitations a'reispec'i ed in the Having thusdescribedmy' invention, wvhat' 'Iclaimis:-'

superposed layers' of flexible material formed at intervals withtooth-engaging holes, a series of, relatively stifi-"trahsvierse"members extending substantially the" entire width "ofthe beltand having1holes.-.the'rein' ana l -provided vwith thimbles surrounding membersand through the layers of the belt, said fastening'device; serving to.connect the transversemembera' to said layers and serving-to con'neetsaid layer-smith each other;

Awhe'reby'the strains 'ap'p'lieduto' .the-zt'himbles in driving the:belt, will be distributed v throughout the transverse, extent of thesame I v andto the several-"layers'composing thebelt. The improveddriving belt consisting 10f 7 In testimony w her'eofi I have smug-mysignature presence ei two .yvitnm eena HESS." Witnesses:

' TnEo.:H.-M :G.A1-u,

